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  • Data Collection: Data Archive

    This collection of datasets from Princeton University each come with detailed descriptions of the data's history, how it was collected, and the data quality. Scroll down to "OPR Data Catalog Search" and either type your search terms into the search box or click "complete listings" to browse the archive. Data is available in text format.

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  • Wilcoxon Rank-Sum Table

    This table shows the critical values values of the Wilcoxon-Mann-Whitney statistics (Us) for various sample sizes (N1 and N2) and p-values (p).

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  • Choosing the Right Test

    This page helps readers know which statistcal tests are appropriate for the different types of data. Two charts display the information. A discussion of study design and sample size, as well as exercise questions with solutions are also provided.

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  • Confidence Intervals

    This applet introduces the concept of confidence intervals. Select an alpha level, sample size, and the number of experiments, and click "Play." For each sample, the applet will show the data points as blue dots and the confidence interval as a red, vertical line. The true population mean is shown as a horizontal purple line, and green ovals indicate which intervals do not contain the true mean.

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  • Quote: Gibbon on Probability

    This day may possibly be my last: but the laws of probability, so true in general, so fallacious in particular, still allow about fifteen years. A quote of English historian Edward Gibbon (1737 - 1794). The quote was written in 1787 and was published after his death in "Miscellaneous works of Edward Gibbon, with memoirs of his life and writings composed by himself" edited by Lord John Seffield, 1796

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  • Dataset Example: Student's T

    This resource explains the t-distribution and hypothesis testing (informally) using an example on laptop quality.

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  • Sample Sizes

    This resource discusses sample sizes and how they are chosen.

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  • Margin of Error

    This resource explains margin of error using an example on presidential popularity polls.

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  • Per Capita

    This resource defines and explains per capita rates using an example on city murder rates.

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  • Percent Change

    This resource defines and explains percent changes using an example on city murder rates.

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